Drug interactions
Dimenhydrinate + Olopatadine intranasal
Severity: Moderate
Dimenhydrinate and Olopatadine intranasal: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs are sedating H1 antihistamines in effect, and intranasal olopatadine can cause somnolence through systemic absorption. Together they can add to drowsiness and impair psychomotor performance, including driving.
What this interaction means in plain words
Dimenhydrinate and Olopatadine intranasal can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive central H1-receptor blockade causing CNS depression.
What to do
Avoid combining the two antihistamines where possible; if both are used, warn the patient about drowsiness and driving, and limit dimenhydrinate dose and duration.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dimenhydrinate and Olopatadine intranasal, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Olopatadine intranasal?
MediHelp rates the interaction as moderate. Dimenhydrinate and Olopatadine intranasal can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs are sedating H1 antihistamines in effect, and intranasal olopatadine can cause somnolence through systemic absorption. Together they can add to drowsiness and impair psychomotor performance, including driving.
How serious is the interaction between Dimenhydrinate and Olopatadine intranasal?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining the two antihistamines where possible; if both are used, warn the patient about drowsiness and driving, and limit dimenhydrinate dose and duration.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Belladonna and opium, Brexanolone, Calcium / magnesium / potassium / sodium oxybates. The full list is on the Dimenhydrinate page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
